| 摘要 |
<p>In a valve of the double-seat type, where a drainage chamber (52) is provided between two valve members (20,22) closing against a common, conical valve seat passage (12), the actuator unit (18) for lifting the valve members is designed so as to automatically increase the closing pressure on the wider valve member (22) when the narrower valve member (20) is caused to be lifted individually. Hereby the drainage chamber may be CIP cleaned by CIP liquid entering from the valve chamber (8,10), without any risk of the CIP liquid forcing its way into the valve chamber (6) associated with the wider valve member (22). Further details such as stuffing boxes for valve rods of the respective valve members may hereby also be cleaned, without any provision of external supply piping for CIP liquid. <IMAGE></p> |
